harden



(No M odel.) 3 Sheets-Sheet 1. E. W. HAR'DEN &VM. R. CONWAY.

VALVE. No. 486,403. Patented Nov. 15, 1892.

w/J f (No Model.) 3 Sheets-Sheet 2.

E. wfHARDEN s M. R. CONWAY. VALVE.

No..486,403. PatentedNov. 15, 1892.

- `UNITED STATES EDWARD W. HARDEN AND MICHAEL R. CONXVAY, CF CINCINNATI, OHIO,

. PATENT OFFICE.

ASSIGNORS TC FREDERIC C. WEIR, OF SAME PLACE.

VALVE'.

SPECIFICATION forming part of Letters Patent N0. 486,403, dated November 15, 1892.

Application filed January 27, 1892. Serial No. 419.461. (No model.)

To @ZZ whom t may concer-n:

Be it. known that we, EDWARD W. HARDEN and MICHAEL R. CONWAY, citizens of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Valves, of which the following is a specification.

Our invention relates to an auxiliary valve for a steam-engine. It is primarily adapted to be used in connection with the engine shown in the Letters PatentNo. 469,563,issued to Harden and Conway February 23, 1892; but it may be used in connection with any other well-known form of valve.

One of the objects of our invention is to apply the steam in more effective manner by means of the auxiliary griddle cut-off valve.

Another object of our invention is to provide a cut-oi valve with ports and passages, so that the full amount of steam can be admitted with the minimum amount of valve movement, and which amount remains constant until the proper time for cutting off and is then cut oif with a minimum movement.

Another` object of our invention is to providea balanced slide and cut-0E griddle-valve.

The various features of our invention are fully set forth in the description of the accompanying drawings, making apart of this specification, in which- Figure lis a top plan view of our improved valve. Fig. 2 is a section on line o5 Fig. 1. Fig. 3 isabottom plan view of the upper main valveseat. Fig. 4 is a cross-section of the auxiliary shell-valve and its seat, showingthe position at the initial point of movement. Fig. 5 is a similar section showing the valve advanced to full opening. Fig. 6 is a similar section showing the valve at the extreme position. Fig. '7 is a similar section at the initial point of opening on its return movement; and Fig. 8 is a view similar to Fig. 4, showing the main valve in position.

l represents the lower or auxiliary valveseat; 2, the upper or main valve-seat.

3 represents the end steam-chambers, and 4 side steam-chambers in the valve-chest.

A represents the auxiliary valve. It is of shell form and receives the steam from the chambers 3 and 4 in the central opening B.

a a represent ports through the valve.

b b b represent ports through the upper or main valve-seat 2, on which the main valve 2, Fig. 8, works. When three ports are thus employed, six cut-off points c of the valve are required to close these ports. In order to admit steam each side of these cut-off points c, we provide a series of passages d in the upper or main valve-seat, so that steam is admittved each side of the cut-offs c from the steam-chambers 4 from the steam-passages d, which are supplied with steam by the passages g in the upper valve-seat, taking steam from the chambers 3. We likewise provide ports ein the lower valve-seat., similar to the ports b, so as to receive steam on the under side of the valve, and' also passages h for supplying steam to the passages g in the lower side of the valve. Thus the upper and lower faces of the valve are subjected to the same steam- ,pressure, and a multiple series of openings or steam-passages are made through the valve, `which balances the valves nearly under the pressure of the steam and allows it to move freely and to open and close quickly, coming to a full opening ata slight throw and continuing this uutiljust before the cut-off point. In Fig. 4 we have shown the position of the valve just on the point of opening. Aslight movement brings it into 'the position shown in Fig. 5, which is full opening. This full opening is maintained as the valve moves forward, the last portion of the movement being shown in Fig. 6. The valve moves backward, mailltaining the full opening until it arrives in the position shown in Fig. 5, when it commences to reduce until it moves into position shown in Fig. 4, which is entirely cut oft", and then continues to move in the same direction with the steam cut off until position in Fig. 7 is reached, which is the reverse of position shown in Fig. 4. In Fig. 7 We have shown a diagram representing the strokes of lthe valve from r to s, representing the working period of the valve stroke, and likewise from s to r.

to' and w represent the central line of the working stroke, in which position the Valve is shown in Fig. 5.

s to o and s to o represent the idle movement at either end of the stroke.

Lines 'rto r represent the extreme movement when the valve is doing full duty.

s to s represent the minimum movement of the valve in working position. It will be observed, therefore, that the valve may be moved a considerable distance without doing any work, always practically clearing the seat and avoiding wearing a shoulder, which is apt to occur when valves are arrested midway of their movement on the seat.

It will be observed that the steam is voided throug'h the valve from the interior ports (La and from the ports cl d on the exterior face ot the valve simultaneously, and that the cuto ouniformly reduces these main and auxiliary ports, simultaneously cutting 0E both ports in its movement, so that by reason of this two-point ad mission twice the actual opening for steam is provided that could be provided from eitherexterioror interior ports used singly, thus reducing the movement of the valve for any given area of steam-open-` ing one half, and by using two ports a a and three ports b b b and three ports d d d avery small movement makes a large area of act-ual .steam-opening of the valve, and so a further increase in a series of these ports would still lessen the necessary valve movement for any desired area of valve-opening. It. is obvious thatl the number of ports leadingthrough the auxiliary valve and its upperand lower seats may be increased or decreased at pleasure. V'Ve have shown two openings 7 8 for admitting the steam into the valve-chamber. Itis obvious that only one opening might be employed. It will be seen that the upper and lower faces of the valve are each the counterpart of the other and that the upper and lower seats are each the counterpart of the other.

It is designed in practice to have the upper side 9 (see Fig. 4) of the upper valve-seat 2 form the seat of the main valve to which the steam is communicated by the passages l0 1l alternately. It is obvious, however, that these ports l0 ll might be used to cover and uncover the steam ports of the stea'm piston chamber instead ot the ports of the main valve; but the preferred form of using this valve is as an auxiliary to a main valve. It

will be observed that the cut-otf portions c are of less dimension than the ports b and that the said ports are closed by the overlapping of two of said cut-offs c, covering the ports b and g, respectively. We thus obtain a perfectly-balanced valve which opens readily on a slight movement, continues at full opening until just before the cnt-ott point is reached and quickly cuts oit, so that we get a minimum amount of movement for the full opening of the cnt-olf. The valve may be operated by any well-known mechanism adjustable so as to be cut oit at any desired position.

Having described our invention, what we claim is- 1. A shell valve A, provided with one or more passages d and one or more ports leading through the valve and one or more ports b above the valve and one or more steam-passages g in the top face of the valve-seat for admitting steam to the ports b, substantially as specified.

2. An auxiliary shell valve having two or more ports b, passages g', supplied from the opening B, one or more ports d in the top face of the valve-supplying ports b, and two or more cut-oifs c, substantially as specified.

3. The shell valve A, provided with the central opening B, ports a through the valve, ports b in the upper seatof the valve,simi1ar ports i in the lower section of the valve, and steam-ports e h in the lower seat of the valve, substantially as specified.

4. A shell valve A, receiving steam into the interior opening B, a series of steam-passages a. through the valve, a series of steam-ports b in the valve-seat, the series of steam-passages g d, and the cut-ols c for closing the ports b g, substantially as specified.

5. In combination with the shell valve A, having the seriesot steam-ports@ d in the top section of the valve and a similar series of ports through the lower section ot' the valve, and the duplex valve seats provided with similar ports and passages, substantially as specified.

6. In combination with the shell valve A, having two or more exterior and two or more interior ports and four or more cut-olts c forreducing or closing simultaneously the ports b and g, whereby the steam is admitted alternately over t-he exterior and interior faces of the valve, substantially as specified.

7. In combination with the shell valve A, having a central opening B, having one or more exteriorports a, and two or more cut-otts c for reducing and closing simultaneously the main and auxiliary ports, substantially as specified.

In testimony whereof we have hereunto set our hands.

EDVARD W. HARDEN. MICHAEL R. CONWAY. Witnesses:

T. SIMMONS, C. W. MILES.

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